To estimate the lethal concentration, we
used seven concentrations of essential oil of
lemongrass spaced on a logarithmic scale, in
accordance with each pest. The upper and lower
limits were determined by preliminary tests. To
solubilize the essential oil, 2% (v/v) acetone and
0.01% (m/v) Tween 80 were diluted in distilled
water. The control consisted of 2% (v/v) acetone
and 0.01% (m/v) Tween 80 diluted in distilled
water.